5/29/12 9:05 AM EDT

Those of you on vacation this Memorial Day probably missed the epic, intra-Republican battle that took place between Donald Trump and Washington Post columnist George Will over the weekend.

On Sunday, Will called the real estate mogul a "bloviating ignoramus" for championing the birther debate: “I do not understand the cost benefit here,” Will said on ABC's "This Week." “The costs are clear. The benefit — what voter is going to vote for him because he is seen with Donald Trump? The cost of appearing with this bloviating ignoramus is obvious, it seems to me. Donald Trump is redundant evidence that if your net worth is high enough, your IQ can be very low and you can still intrude into American politics.”

Never one to be outdone, Trump returned fire on Sunday night, tweeting, “George Will may be the dumbest (and most overrated) political commentator of all time. If the Republicans listen to him, they will lose.”